<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <cpn :number1='num1' :number2='num2' @num1change='num1change' @num2change='num2change'></cpn>
    </div>

    <template id="cpn">
        <div>
            <h2>props:{{number1}}</h2>
            <h2>data:{{dnumber1}}</h2>
            <!-- <input type="text" placeholder="请输入值1" v-model='number1'> -->
            <input type="text" placeholder="请输入值1" :value='dnumber1' @input='num1Input'>
            <h2>{{number2}}</h2>
            <h2>data:{{dnumber2}}</h2>
            <!-- <input type="text" placeholder="请输入值2" v-model='number2'> -->
            <input type="text" placeholder="请输入值2" :value='dnumber2' @input='num2Input'>
        </div>
    </template>
    <script src='../js/vue.js'></script>
    <script>
        const cpn = {
            template: '#cpn',
            props: {
                number1: {
                    type: Number
                },
                number2: {
                    type: Number
                }
            },
            data() {
                return {
                    dnumber1: this.number1,
                    dnumber2: this.number2
                }
            },
            methods: {
                num1Input(event) {
                    //1.将input中的value值赋值到dnumber中
                    this.dnumber1 = event.target.value;
                    //2.让父组件能够改变值，发射一个事件
                    this.$emit('num1change', this.dnumber1)

                    //3.让num1是num2的一百倍
                    this.dnumber2 = this.dnumber1 * 100;
                    this.$emit('num2change', this.dnumber2);
                },
                num2Input(event) {
                    this.dnumber2 = event.target.value;
                    this.$emit('num2change', this.dnumber2)

                    this.dnumber1 = this.dnumber2 / 100;             
                    this.$emit('num1change', this.dnumber1);
                }
            }

        }

        const app = new Vue({
            el: '#app',
            data: {
                num1: 1,
                num2: 0
            },
            components: {
                cpn
            },
            methods: {
                num1change(value) {
                    this.num1 = parseFloat(value);
                },
                num2change(value){
                    this.num2 = parseFloat(value);
                }
            }
        })
    </script>
</body>

</html>